Multi-layer hose

Inactive Publication Date: 2009-01-01
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In view of the above, an object of the present invention is to provide an improved multi-layer hose which can effectively overcome drawbacks encountered in conventional multi-layer hose.
[0008]Another object of the present invention is to provide a multi-layer hose being superior in fuel barrier performance to those produced by conventional fuel-barrier techniques, and being excellent in fuel barrier performance against the alcohol-containing fuel while exhibiting a strong adhesiveness among the intermediate layer and the inner and outer layers.

Problems solved by technology

However, drawbacks have been encountered in the above conventional techniques.
However, as the thickness of the fuel-barrier layer is increased in order to improve the fuel barrier performance, the hose is decreased in flexibility and formability.
In other words, it becomes difficult to secure both the formability and the fuel barrier performance of the multi-layer hose with increasing the fuel-barrier layer in thickness.
However, this raises a fear that an unreacted adhesive component is extracted into fuel thereby adversely affecting peripheral parts.

Method used

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Examples

Experimental program
Comparison scheme
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example 1

[0024]A multi-layer hose having a three-layer structure as shown in FIG. 1 was produced as follows. The three-layer structure included an inner layer denoted by the reference numeral 1A in FIG. 1 and formed of vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene ternary copolymer fluoroelastomer on which a peroxide was used as a vulcanizing agent. An intermediate layer denoted by the reference numeral 1B was formed of ethylene-vinyl alcohol copolymer (available from KURARAY CO., LTD. under the trade name of F101). An outer layer denoted by the reference numeral 1C was formed of epichlorohydrin rubber (ECO) on which thiourea was used as a vulcanizing agent. In the production process, inner layer 1A, intermediate layer 1B and outer layer 1C were extruded to form a tubular hose. Then, vulcanization (included a primary one made at 150° C. for 30 minutes and a secondary one made after the primary one at 160° C. for 90 minutes) was conducted on the tubular hose, thereby obtaining t...

example 2

[0026]A procedure of Example 1 was repeated with the exception that inner layer 1A was formed of vinylidene fluoride-hexafluoropropylene binary copolymer fluoroelastomer on which a peroxide was used as a vulcanizing agent and that intermediate layer 1B was formed of ethylene-vinyl alcohol copolymer resin (available from KURARAY CO., LTD. under the trade name of M100), thereby obtaining the multi-layer hose having the three-layer structure of Example 2.

example 3

[0027]A procedure of Example 1 was repeated with the exception that inner layer 1A was formed of vinylidene fluoride-hexafluoropropylene binary copolymer fluoroelastomer on which a peroxide was used as a vulcanizing agent, thereby obtaining the multi-layer hose having the three-layer structure of Example 3.

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Abstract

A multi-layer hose usable for a fuel hose of an automotive vehicle. The multi-layer hose includes an intermediate layer formed of a resin whose main component includes at least one of polyvinyl alcohol and ethylene-vinyl alcohol copolymer. An outer layer is provided formed of rubber and disposed outside the intermediate layer. Additionally, an inner layer is provided formed of fluoroelastomer and disposed inside the intermediate layer to be laminated directly on the intermediate layer.

Description

BACKGROUND OF THE INVENTION[0001]This invention relates to improvements in a multi-layer hose preferably usable for a fuel hose of an automotive vehicle, and more particularly to a multi-layer hose having a strong adhesiveness between layers while having an excellent fuel permeation resistance against fuel such as an alcohol-containing fuel.[0002]In recent years, mainly in the United States, the emission control for hydrocarbon-based evaporative emissions from automotive vehicle fuel systems has been strictly tightened, and therefore rubber hoses for fuel having various structures have been developed to meet the control. Particularly in order to achieve a sealability, a fuel permeation resistance and a flexibility which are required in a connecting pipe, rubber hoses variously proposed have a structure where rubber materials serving as inner and outer layers are laminated on a fuel-barrier resinous material serving as intermediate layer.[0003]As proposed in Japanese Examined applica...

Claims

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Application Information

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IPC IPC(8): F16L11/04
CPCB32B1/08B32B25/08B32B27/08Y10T428/1393F16L11/045F16L2011/047F16L11/04
InventorSHINODA, ATSUHIROKUMAGAI, HIROSHI
OwnerNISSAN MOTOR CO LTD